Three test tubes are given, one contains sodium phosphate, the other contains sodium
| March 31, 2021 | education
Three test tubes are given, one contains sodium phosphate, the other contains sodium sulfate, and the third contains sodium chloride. How do you know where what is?
Qualitative reaction to phosphate ion:
Na3PO4 + 3AgNO3 = NaNO3 + Ag3PO4 (yellow precipitate).
Qualitative reaction to sulfate ion:
Na2SO4 + Ba (OH) 2 = 2NaOH + BaSO4 (white fine-crystalline precipitate, poorly soluble in acids),
Na2SO4 + 2AgNO3 = 2NaNO3 + Ag2SO4 (white precipitate).
Qualitative reaction for chloride ion:
NaCl + AgNO3 = NaNO3 + AgCl (white curd, soluble in NH4OH).
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